Regulator.



H. A. LAYCOCK.

REGULATOR. APPLICATION man ocr. 2r, 1913.

Patented Feb. 13, 1917.

ETTNESSES @ai UNITED STATES PATENT OFFICE.

HARRY A. LAYCOCK, OF SCHENECTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRICCOMPANY, A CORPORATION OF NEW YORK.

REGULATOR.

Patented Feb. 13, 1917.

Application filed October 27, 1913. Serial No. 797,614.

To all whom it may concern.'

Be it known that I, Hanny A. LaYooCK, a citizen of the United States,residing at Schenectady, in the county ot Schenectady, State of vNewYork, have invented certain new and useful Improvements in Regulators,of which the following is a4 specification.

My invention relates to regulators or transforming apparatus whichetfectan 1nterchange of energy between two electrical systems.

Wherever 'an alternating current system and av direct current system areinterconnected by means of a transforming,r apparatus, such as a rotaryconverter or a motor generator set, it is customary to provide some sortof regulator in order that there may be an equal distribution ofloadxbetween the two systems. This regulator may be manual or automatic.If automatic, .it may be responsive to various conditions 1n the twosystems.

The object of my invention is to provide an improved form of automaticregulator for use in connection with a transforming apparatus connectedbetween an alternating current and a direct current system. In myinvention I provide a single regulating device responsive to changes ofload in the two systems and apply it to vary the field excitation of thetransforming apparatus.

I have shown my regulator as applied to a motor generator set comprisingan induction motor and a direct current dynamo. l/Vhenever the speed ofthis set exceeds the synchronous speed ofthe induction motor it isobvious that the latter will act as an induction generator and be drivenby the direct current machine. For varying the ield excitation of thedirect current machine and hence the speed of thc set, l introduce anelectrically operated rhcostat in the eld circuit. I control thisrheostat by means of a floating contact which is oscillated in oppositedirections by solenoids whose strength is dependent on the load on therespective systems.

My invention will be more clearly understood from an inspection oi theaccompanying drawingr in which the single figure is a diagrammatic Viewshowing the application of my invention.

In the drawing I have indicated an alternating current system l suppliedby a generator 2 and a direct current system 3 supplied by a generatorl. AlthoughIhave shown the alternating current system as three phase,this is only for the purpose of description, and my invention could beas well applied to an alternating current System of any phase. Connectedto the alternating` current system is an induction motor 5 mounted onthe saine shaft with a direct currentmachine (i which is in turnconnected to the direct current system. This device, then, constitutes arotary transforming apparatus which is essentially a motor generator sethaving an alternating current element and a direct current element,either of which may drive the other. The direct current element isprovided with a shuntiield 7, in series with which is an electricallyoperated rhcostat S.

This rhcostat comprises thc ordinary series of resistance elementsconnected to contact points, and a pivoted contact armi. 9 passing overthese contact points. For tie actuation of this contact arm, I providetwo solcnoids` l0 and ll whose cores are connected rigidly together andpivotally conncctcd to the lower end of the contact arm.

These solcnoids are wound to act in opposite directions and their commonterminal is connected through a resistance 12 to one side ci thc directcurrent system. sistancc l2 merely serves to `decrease the current inthe solcnoids.

For energizing the rheostat I provide a contactor 20 consisting of abalanced contact arm 2l which is connected to the other side of thedirect current system by means of the .connection 22, and whichoscillates hctwcen the fixed-contact points 23 and 2i. Contact point 23is connected to the solenoid l0, while point 24 is connected to thesolenoid ll. To the outer ends of the balanced contact arm I pivotallyconnect the cores of solcnoids 25 and 26. Solenoid 25 is energized fromthe current transformer 27 connected to one phase of the alternatingcurrent system. -Tlieffrlieostat 28 is bridged across thesolenoiii'circuit for the This reregulation of the current suppliedthereto. The solenoid 26 is connected to opposite sides of a shunt 29 inthe direct current system.

The operation of my.device will be as follows: Let us suppose that theload on the alternating current system is greater than on the directcurrent system. It the device is properly adjusted, the solenoid 25 willthen overpower the solenoid 26, causing the contact arm 21 to touch thepoint 23, thereby energizing the solenoid 10. This will result in movingthe contact arm 9 so as to increase the resistance in series with thefield.. This increase in resistance will result in the decrease ofexcitation of the field 'of the direct current element and cause aconsequent increase in the speed of the motor generator set. Suchincrease in speed will tend to drive the alternating current element 5as an induction enerator, and thereby supply energy to t e alternatingcurrent system. It will thus be seen that the desired result has beenaccomplished, namely, of taking energy from the direct current systemwhich has the lighter load and supplying it to the alternating currentsystem which has the heavier load.

In case the conditions are reversed and the load on the direct currentsystem is heavy, the reverse series of operations will occur. In thiscase the solenoid 2G overpouvers the solenoid 25 and contact arm 2lmoves so as to energize the solenoid 11 and thereby decrease theresistance inserted in the shunt field. This will result in slowing downthe motor generator set and when its speed has fallen below thesynchronous speed ot' the alternating current element, the latter willact as a motor and drive the direct current element as a generator. Thiswill supply energy to the direct current system and take it from thealternating current system.

It will thus be seen thatmy device constitutes a single means controlledby the ratio of the loads on the respective systems. which in turncontrols the direction ot'the inter-` change of energyfbctween the twosystems.

While I have shown herein the preferred embodiment of my invention, I,conceive that various modifications i'night be made thcrein'and I donot desire to be limited to the specific construction herein shown, butseek to cover in the appended claims those modifications which comewithin the scope and spirit of my invention.

What I claim as newand desire to .secure by Letters Patent of theIinited States, is

1. In combination, an alternating current system, a direct currentsystem, means for effecting an intenchange of energy between the twosystems in either direction, and a single means controlled by the ratioof the loads on the two systems to control the diyrection of interchangeof energy.

In combination, an alternating current y a magnetic field, and a singlemeans controlled by the ratio of the loads( on' the t wo systems tocontrol the field of said first named means.

3. An alternating current circuit and\its source, a direct currentcircuit and its source, rotary transforming ap aratus foi transferringenergy between t e circuits, means for exciting said transformingapparatus and a single means 'controlled by the currents in saidcircuits to control the excitation ot' said transforming apparatus.

4. An alternating current circuit and its source, a direct currentcircuit and its' source, rotary transforming apparatus for transferringenergy between the circuits, a field winding for exciting saidapparatus, a resistance in series therewith, anda single meanscontrolled by the currents* n said circuits to add resistance to orsubtract resistance from'the circuit of the field winding of saidapparatus.

5. In. combination, an alternating current system, a direct currentsystem, a reversible motor generator set comprising an alternatingcurrent element and a direct current element connected between saidsystems, a

Afield winding for one of saidelements, a resistance in seriestherewith, and solenoids responsive to changes in curuent in .therespective systems controlling said resistance.

(S, In combination, an alternating current system, a direct currentsystem, a reversible motor generator set comprising an alternatingcurrent element and a direct current element connected between saidsystems, a field winding* on said` direct current element, a resistancein series therewith, and solenoids responsive to changes in currents inthe respective circuits controlling the resistance in the field of thedirect current element. f

7. In eombinationf'an alternating current system, a direct curlentsystem, a transforming apparatus for transferrlng energy between saidsystems, field winding for said apparatus, and a device for controllingthe current inthe field of said transforming apparatus comprising twosolenoids controlled by the load on the respective systems, a conlactoractuated in opposite directions b v said solenoids, and an electricallyoperated rheostat in said field circuit energized through saidcontactor.

8, in combination, an alternating current system, a direct currentsystem, a transforming apparatus transferring energy hetween saidsystems, a field winding for said apparatus, and a device forcontrolling the current in the field Winding of said transformingapparatus comprising two solenoids controlled by the load on the respective systems, fixed contact points, a balanced Contact arm floatingbetween said fixed points, and actuated by said solenoids, and anelectrically operated rheostat in said eld circuit adapted to beoperated in opposite directions upon the Contact by the 10 said arm withthe respective points.

In Witness whereof7 I have hereunto set my hand this 25th day of October1913.

HARRY A. LAYCOCK.

Vitnesses:

MARGARET An. DELEHANTY, HELEN ORFORD.

